He ordered 4,000 unarmed citizens, who had surrendered, to be killed in the Circus Maximus. But who is able to count those, whom he killed here and there in the city whoever wished, until a certain Fufidius suggested that he should leave some alive to rule? He published by a new and unheard of example a list of proscription, in which were contained the names of those who were to be killed.; [...] He ranted not only against those who had raised arms against him, but even dum-de-dum citizens, because of their large wealth, he added to the number of outlaws.

I cannot see what quisquis is doing there in the nominative. Is it not that Sulla killed whomever he wished? Why is it not 'quemquis voluit'?

I'm not sure why 'Novō et inaudītō exemplō' is all in the ablative. Is it, as I wrote, ablative of means?

Finally, utter confusion! 'but even to the calm of the soul/feelings/pride citizens...I don't have a clue what's happening here.

You can read, I think // Possible est ita legi, ut credo:quisquis volvit // whoever went about [anyone going about in the street]Novō et inaudītō exemplō // in a new, unheard-of precedentquiēti animī // calmly he added, as calmly as you like he added, without any fuss he added

adrianus wrote:quiēti animī // calmly he added, as calmly as you like he added, without any fuss he added

Is it not just "cives quieti animi," "those citizens [who were] of a quiet mind" [i.e., not rebellious]? As in, he didn't proscribe only those who had crossed him, but also regular citizens who were worth a lot of money (as their property was up for grabs after being proscribed)?